modelBuoyancy
Extends from TransiEnt.Basics.Icons.Block, TransiEnt.Basics.Icons.ThermalStorageBasic (Icon for thermal storage model).
Information
1. Purpose of model
Adds Buoyancy to a stratified storage.
2. Level of detail, physical effects considered, and physical insight
Convective energy flow is considered as heat flow of the same amount.
3. Limits of validity
Purely technical component without physical modeling.
4. Interfaces
heatPort[N_cv]: Gets the temperatures from the temperature layers and returns the heat flow due to boyancy back
5. Nomenclature
The input parameters
6. Governing Equations
(no equations)
7. Remarks for Usage
This model should be used to add buoyancy to a one dimensional water storage model.
8. Validation
9. References
This model is largely based on the model "Bouyancy" in the Modelica Buildings-library (https://github.com/lbl-srg/modelica-buildings.git)
10. Version History
Model revised by Pascal Dubucq (dubucq@tuhh.de) on Wed August 24 2016. Control volumes are now in intuitive order (1 = bottom, N_cv = top volume)
Model created by Tobias Ramm (tobias.ramm@tuhh.de) on Fri Mar 20 2015
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.Volume | V | Volume of tank | |
| Integer | N_cv | 3 | Number of finite control volumes |
| Modelica.Units.SI.Time | tau | Time constant for buoyancy mixing | |
| Modelica.Units.SI.Density | rho | 998 | Density, used to compute fluid mass |
| Modelica.Units.SI.SpecificHeatCapacity | c_v | 4.2e3 | Specific heat capacity |
| Real | k | V*rho*c_v/tau/N_cv | Proportionality constant, since we use Delta_T instead of dH |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a | heatPort | Heat input into the volumes |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.HeatFlowRate | Q_flow | Heat flow rate due to buoyancy from segment i to i+1 | |
| Modelica.Units.SI.TemperatureDifference[N_cv - 1] | Delta_T | Driving Temperature difference between adjoining control volumes |